Cita APA (7a ed.)

Carr, E. H. (2001). The Twenty years' crisis: 1919-1939 : an introduction to the study of international relations. Perennial.

Cita Chicago Style (17a ed.)

Carr, Edward Hallett. The Twenty Years' Crisis: 1919-1939 : An Introduction to the Study of International Relations. New York: Perennial, 2001.

Cita MLA (9a ed.)

Carr, Edward Hallett. The Twenty Years' Crisis: 1919-1939 : An Introduction to the Study of International Relations. Perennial, 2001.